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Polluted by sewage 852 times in 2025 lasting 3,291 hours
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Donate NowHere are all the reported sewage overflow totals for Tonypandy in 2025. Sometimes sewage can be being dumped for months at a time.
Reporting refers to how much of the time the monitoring was active. In this place all the declared CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s appeared to have monitoring enabled for more than 50% of the year
| Company | Waterway | Site | Sewage Dumps | Duration (Hours) | Reporting % |
|---|---|---|---|---|---|
| Dwr Cymru Welsh Water | Rhondda Fawr | Station Rd CSO, Dinas, Porth | 120 | 919 | 95.8 |
| Dwr Cymru Welsh Water | Nant Clydach | A CSO at Clydach Vale Davies Street | 122 | 709 | 98.9 |
| Dwr Cymru Welsh Water | River Rhondda Fawr | Rear of Richards Terrace CSO | 50 | 562 | 89.9 |
| Dwr Cymru Welsh Water | Rhondda Fawr River | GLANNANT ST/DINAS ROAD CSO | 85 | 318 | 99.2 |
| Dwr Cymru Welsh Water | Rhondda Fawr | CSO O/S Welcome Inn, Tylacelyn Rd, Penygraig | 82 | 215 | 99 |
| Dwr Cymru Welsh Water | Nant Clydach | Railway Terrace CSO, Clydach Vale | 60 | 166 | 97.1 |
| Dwr Cymru Welsh Water | Rhondda R - Source To Conf River Rhondda Fach | Penygraig Rd CSO, Penygraig | 75 | 137 | 99 |
| Dwr Cymru Welsh Water | River Rhondda | Llwynypia Rd CSO, Tonypandy | 73 | 105 | 99.1 |
| Dwr Cymru Welsh Water | Rhondda River Fawr | Llwynypia SPS | 45 | 57 | 99.9 |
| Dwr Cymru Welsh Water | Rhondda Fawr | CSO at Penycraig - Tylacelyn Road | 42 | 27 | 99.2 |
| Dwr Cymru Welsh Water | Rhondda River Via A Culvert | Old Brithweunydd Road CSO, Tonypandy | 38 | 26 | 99.9 |
| Dwr Cymru Welsh Water | Nant Clydach | CSO at Tonypandy, Rear of De Winton St | 11 | 17 | 99.9 |
| Dwr Cymru Welsh Water | Rhondda Fawr | CSO OFF YNYSCYNON ROAD TREALAW | 16 | 15 | 99.4 |
| Dwr Cymru Welsh Water | Rhondda R - Source To Conf River Rhondda Fach | Penygraig Nantgwyn St/Hill St Jn CSO | 24 | 7 | 99.5 |
| Dwr Cymru Welsh Water | River Ely | CSO at Penrhiwfer Ashdale Rd CSO, rear of No23 | 6 | 4 | 99.8 |
| Dwr Cymru Welsh Water | Rhondda Fawr | CSO at 136 Tyntyla Road, Tonypandy | 3 | 0 | 99.8 |
EDM (Event Duration Monitoring) data and Consented Discharges to Controlled Waters with Conditions from Environment Agency & Data Map Wales, and Scottish Water
Experimental derived data from Thames Water API, Some data may be missing or inaccurate. Live sewage data from Stream Water API
Annual figures up to and including 2025 come from official water company returns. The 2026 figure is our own estimate, derived continuously from the companies' live data feeds.
Uses Environment Agency rainfall data from the real-time data API (Beta) - Rainfall data is delayed by up to two days.
This website is intended to provide an accurate representation of the Environment Agency data. The data is hard to use, and thus some errors may have been made. If you find something that is incorrect, please raise an issue at the GitHub issues page and we'll endeavour to fix it quickly.
This project is not associated, approved or endorsed by any of the companies whose logos you see here.
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org